X-ray diffraction at ultra-high pressures
X-ray diffraction at ultra-high pressures
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DOI：
10.1016/0022-3697(63)90092-1
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发表时间：
1963-12
影响因子：
4
通讯作者：
N. B. Owen;P. L. Smith;J. Martin;A. J. Wright
中科院分区：
文献类型：
--
作者：
N. B. Owen;P. L. Smith;J. Martin;A. J. Wright
描述了一种装置，该装置设计用于从经受非常高的压力的材料获得X射线衍射图案。微型Bridgman金刚石砧用于挤压样品，而无需传统形式的环形垫圈。载荷可直接通过螺旋压缩弹簧或通过载荷放大率约为20的液压增强器施加。模型，以适应两个标准的X射线照相机的5.73和11.46厘米直径已经作出，都可以振荡的垂直轴在通常的方式。一个模型设计为通过300°的夹角振荡，并提供了将测试样品加热到250°C的条件。X射线衍射图已获得超过标称200千巴的压力下。硫化镉和碲化镉的工作结果与此装置获得的压力高达200千巴给出。在压力作用下，纤锌矿结构的硫化镉转变为岩盐结构，而碲化镉则由锌锌矿结构转变为岩盐结构，然后转变为β-锡结构的双原子类似物。
Apparatus is described which was designed to obtain X-ray diffraction patterns from materials subjected to very high pressures. Miniature Bridgman anvils of diamond are used to squeeze the sample without the conventional form of annular gasket. Load is applied either directly by means of a helical compression spring or through a hydraulic intensifier with a load magnification of about 20. Models to fit two standard X-ray cameras of 5.73 and 11.46 cm diameter have been made and both can oscillate about the vertical axis in the usual manner. One model has been designed to oscillate through an included angle of 300° and has provision for heating the test sample to 250°C. X-ray diffraction patterns have been obtained at pressures exceeding a nominal 200 kb.The results of work on cadmium sulphide and cadmium telluride up to pressures of 200 kb obtained with this apparatus are given. Cadmium sulphide in the wurtzite form is found to transform to the rock salt structure under pressure while cadmium telluride transforms from the zincblende structure first to the rock salt structure and then to a diatomic analogue to the β-tin structure.